U.S. President Donald Trump said on Sunday that Iran could telephone if it wants to negotiate an end to their two-month war, stressing that Tehran can never have a nuclear weapon, while Iran's foreign minister returned to Pakistan for talks despite the absence of U.S. counterparts.

Hopes of reviving peace efforts receded on Saturday when Trump scrapped a visit to Islamabad by his envoys Steve ?Witkoff and Jared Kushner, even as Iranian Foreign Minister Abbas Araqchi continued to shuttle between mediating countries.

"If they want to talk, they can come to us, ?or they ?can call us. You know, there is a telephone. We have nice, secure lines," Trump told "The Sunday Briefing" on Fox News.